Baxter is from the Old English bæcestre (female baker) — the feminine occupational suffix -ster later applied to both genders. Baxter International — major American healthcare company.
Baxter does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Baxter reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.